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Re: PA Circuit Upgrade
I currently use 24 volt yes I want More Power.? I come from the Home Improvement Generation.. Tim The Tool Man Taylor "More Power" ?--Insert Grunt Here-- ? On Mon, May 1, 2017 at 11:13 AM, OZ9AEW <madsen1960@...> wrote:
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Re: Power Supplies
LOL I actually use a computer heatsink from a CPU it's like 3x2 and has 20 or so fins and I have a cpu fan attached to it's back.? I have push this thing to the max and the hottest I have had it on JT65 was 60c and was plenty cool by next TX. On Mon, May 1, 2017 at 10:52 AM, KC8WBK via Groups.Io <cruisenewsnet@...> wrote: What type of heat sink are you using? |
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Re: PA Circuit Upgrade
So as I investigate this some more it appears this may be easier than I had thought.? But I really don't know, I'm just a new Ham and trying to apply some logic and I have no real electronics schooling, so bear with me... ?at c133 and r135 I could tap with 10R and .1uf like the ubitx shows and flip t6 around at the regulator then move to small breakout board for dual 2n2219 second preamp stage and coil out like t10 on the ubitx schematic tap out of the regulator to feed the dual irf510's then out to choke and coil and tie back in at t7 flipped as well.? Sounds like a bit of work but I think it can be done.? I would like the input of any of the engineers that follow the post, and anyone else who cares to input. ?thanks 73 km4ous On Mon, May 1, 2017 at 10:17 AM, Steve Greer <km4ous@...> wrote: More power???? I was looking at the schematic at the PA circuit and it appears that it was wired with a thought of dual IRF's in the future.? What got me thinking was looking at the ubitx that has dual IRF's and comparing the 2, the coils have the winding's with unused taps, could one of the electronic engineers draw something up that we could mod a Push Pull dual IRF's.? I really don't know how to go about it myself but it looks possible.?maybe??? |
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PA Circuit Upgrade
More power??? ?I was looking at the schematic at the PA circuit and it appears that it was wired with a thought of dual IRF's in the future. ?What got me thinking was looking at the ubitx that has dual IRF's and comparing the 2, the coils have the winding's with unused taps, could one of the electronic engineers draw something up that we could mod a Push Pull dual IRF's. ?I really don't know how to go about it myself but it looks possible.?maybe???
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Re: Power Supplies
I use 3 PSU total I use a WII power supply to power the radio itself and I use 2 xbox 360 power bricks in series for 24 Volts to the PA.? The WII PSU is 10 amps rated and the xbox supplies are 16 amps each so 32 amps total.? I get about 15-20 watts out on 40 and and 30 watts out on 80 and 10 watts out on 30M.? Antenna Antenna Antenna.? What are you using for an antenna?? I often hear about Hams buying $1000+ radios and Kw amps but if your antenna is garage it's just a waste, the antenna should be one of the largest investments in a station. On Mon, May 1, 2017 at 9:52 AM, KC8WBK via Groups.Io <cruisenewsnet@...> wrote:
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Power Supplies
I am wondering what others are using for power supplies. I have received signal reports of weak signal, and there was a comment that it might be a lack of power during transmission. I am using a wall wart, rated at 12V, 1.65 amps. I went to the thrift store and got a laptop power supply, rated at 20V, 2.25 amps. I measured 20.6V at no load. This power supply is now connected to PA power.? I have replaced the heat sink with one about twice the mass, 13 grams vs. 6 grams, and not quite twice the size of the original.? It seems to pass the initial smoke test. I am hoping that this combination of two power supplies resolves the weak signal problem.? There are other options, such as a lead acid battery on a charger, or my big 20 amp 12V power supply. |
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Re: Simple audio muting circuit
Tried this tonight and it works! Only small issue is that when the volume is on full there is an audio oscillation. Its right at the end of the pot though so not a problem because i never turn it up full volume. There is also some digital noise from the raduino leaking through the power supply i think that comes through the audio whilst the cap on the receiver power supply still has some charge. Hoping the click power supply mod will get rid of it. A massive improvement overall and i can now use my BITX40 witb headphones as i found the ptt pop literally painful without this mod. Also tried the diode across k1 by itself first. There was no change to the ptt pop. Thanks and 73 John. |
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BITX QSO Night, Sunday, May 7, 9pm Local Time, 7.179 MHz
BITX QSO Night, Sunday, May 7, 9pm Local Time, 7.179 MHz |
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Re: Bitx qso night
Michael Davis
Nice going Craig. I had no success last night and heard an annoying strange signal just below us. It was also on web sdr, which I frequently use to hear band conditions and to try and hear my signal. Earlier in the week I made 2 contacts in Switzerland, 3700 miles away. Surprised and pleased.
Sent from Mike's iPad WA1MAD |
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Re: R15 and ADE-1 mixer getting very hot
Gian I had uploaded the ADE-1 based schematic. you can see from my post. all the bestOn Mon, May 1, 2017 at 3:46 PM, Giancarlo via Groups.Io <i7swx@...> wrote:
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Regards
Sarma ? |
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Re: Was Noob in need of some assistance. Now: [BITX20] Input antenna attenuation?
Yes I have used batteries to power it. 4 18650's 4.1v li-ion batteries. Then a nice 7812 regulator. Tried that 3 weeks ago.? I didn't build an attenuator so I didn't force feed it a signal like I had planned. I ended up at work all weekend :-(? The psu I am using is a korad linear power supply. 20 micro volt peek to peek. |
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Re: adding VK3YE AGC to BITX40
Nice write up Paul. I am very happy with the VK3YE AGC. It provides just the right amount of AGC action for my tastes and after many hours of operating with it in all kinds of band conditions I have not heard it do anything annoying. I put a switch in series with the LDR so I can turn the AGC off but it is always on. I built my rig from scratch in a modular fashion and that audio board with Peter's AGC will surely get reproduced and used in my future projects. Your white LED probably works as well or even better than the red one I used. The LED and LDR I used are: http://www.taydaelectronics.com/led-5mm-red-water-clear-ultra-bright.html 73 - Jerry W0PWE |
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Re: Simple audio muting circuit
NM I just read it a 3rd time you said the coil not the tx/rx switching. So just between the coil power cathode to + On Mon, May 1, 2017 at 7:02 AM, Steve Greer <km4ous@...> wrote:
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Re: Simple audio muting circuit
Are you referring to the 2 diodes for strong signal rejection?? So you added to same pins as K2? On Mon, May 1, 2017 at 1:07 AM, John Pieper <j.pieper@...> wrote:
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ON2AAV